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Speed/Power Development

(50) AGREEMENT BETWEEN VIDEO ANNOTATION SOFTWARE AND 3D MOTION TRACKING FOR MEASURING BARBELL KINETICS DURING A HIGH INTENSITY FUNCTIONAL TRAINING BOUT

Saturday, July 13, 2024
10:00 AM – 11:30 AM East Coast USA Time
Location: Exhibit Hall
Abstract Details: High-intensity functional training (HIFT) involves vigorous multimodal circuit training with auto-regulated rest periods. Performance is typically gauged by how quickly work is completed, and to this end, dependent on finding the fastest sustainable pace for each exercise prescribed within a workout. However, objectively finding and precisely tracking ideal pacing is nearly impossible without technological assistance. One method would include recording workouts and utilizing video annotation software (VAS) to quantify kinetics but is limited by camera quality and standardization. Secondarily, 3D motion tracking systems (MTS), can provide live feedback with less procedural restrictions, but is limited to specific exercises and can fail to detect repetitions. Data loss may be avoided having VAS serve back-up when repetitions are lost. However, agreement between technologies must first be established.

Purpose: To determine agreement between VAS and MTS for monitoring barbell velocity and power during a 5-minute bout of HIFT.

Methods: A sub-sample of eighteen HIFT-trained athletes (29.4 ± 8.4 years, 173±8 cm, 83±15 kg) from a larger investigation examining the effect of a pre-workout supplement on HIFT workout performance was used for this study. Over a 4-week period, participants randomly completed a 5-minute repeated circuit of 9-calorie rowing, six barbell thrusters at 43.1 kg, and three 0.61 m box jumps after consuming supplement or placebo. All workouts were recorded by tablet camera with average concentric barbell velocity (V) and power (P) during thrusters being specifically tracked by MTS (PERCH, Catalyft Labs, Inc., Cambridge, MA, USA). Post-exercise, VAS (Kinovea v.0.9.5, Free Software Foundation, Inc., Boston, MA, USA) was used to also quantify average concentric V and P for all completed thruster repetitions during both 5-minute workout sessions. Subsequently, quantified kinetics for all complete sets (i.e., six detected repetitions from both MTS and VAS) were organized (n = 816 sets), and then a random sample of 555 sets (~68%) was selected for agreement analysis.

Results: Differences and relationships between raw scores obtained by MTS and VAS were initially assessed by paired samples t-tests and Pearson's correlation analysis. Though Pearson’s correlations indicated positive relationship (r = 0.33–0.49, p < 0.001), paired samples t-tests revealed a significant difference in V (MTS: 1.19 ± 0.41 m/s, VAS: 1.22 ± 0.19 m/s, p = 0.032) but not P (MTS: 482 ± 189 W, VAS: 487 ± 111 W, p = 0.468). However, negative relationships were observed between the average of, and differences between, MTS and VAS for V (r = -0.66, p < 0.001) and P (r = -0.54, p < 0.001), with large coefficients of variation (CV = 1,098–3246%). MTS produced lower estimates of V (mean bias = -0.04 m/s, 95% C.I. = -0.74 to 0.81 m/s) and P (mean bias = -5 W, 95% C.I. = -321 to 331 W) compared to VAS, and these were not consistent across the observed range of velocities (0.61-1.90 m/s) and power (181-780 W).

Conclusion: Compared to MTS, VAS overestimates V and P, and the differences are exacerbated with faster or more powerful repetitions. PRACTICAL APPLICATION: Simultaneous utilization of MTS and VAS, with the latter serving as back-up for undetected repetitions, would not be a suitable solution for tracking barbell thruster kinetics during a HIFT workout. 

Acknowledgements: ACKNOWLEDMENTS: This study was funded by SHIFTED, LLC, Eugene, Oregon.